The labor and environmental movements have had a complicated relationship with periods of cooperation as well as conflict, but recently there has been increasing collaboration at the national level. Whether such a trend of cooperation can be sustained will partially depend on grassroots‐level connections between the two movements. However, there has been little empirical research on the environmental attitudes of union members, which is important for understanding the potential for shared values between union members and environmental activists. This article analyzes 1993, 2000, and 2010 General Social Survey data to examine if the environmental attitudes of people in union households have changed given shifting labor–environment relations and broader political‐economic conditions. We find that union membership does not influence environmental concern in weaker economic times (1993 and 2010) but that it has a positive effect on environmental concern in stronger economic times (2000). Thus, union households are generally no less concerned about the environment than nonunion households. Therefore, strengthening connections between union members and environmental activists may be a feasible strategy for invigorating both the labor and environmental movements.